Here's the script Extraction/Replacer tool for Pure Goddess.

It outputs two files: A .bin file, and a .txt file. Text file is encoded using Shift-JIS. Bin file seems to contain the code. Text file contains just the strings.

There are no comments, even though it looks like there should be. You try putting in a line that starts with a semicolon, and it will display that. Don't add or remove lines, just replace the text.